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1992 Toyota Pickup: Error Code 52?

The Error code is Stored in car computer called ECM.

To Get this error code manually without Scan tool or Code reader,there is procedure.
Visit the Help link Shown Below:----

How To Retrieve Error Codes On 1992 Toyota Pickup?

http://howtobyme.blogspot.in/2012/05/how-to-retrieve-error-codes-on-1992.html

About Error Code 52:----

The code 52 means there is a problem in the knock sensor or the wiring going to the knock sensor.

WHERE ARE KNOCK SENSORS LOCATED ON TOYOTA PICKUP?
The knock sensors located on the passenger side of the cylinder block under the intake manifold.

Typically what happens is the wiring that is going inside the main harness from the knock sensor has grounded shielding to protect the signal from the knock sensor to the engine control computer this has a tendency to short to the internal signal wire causing the sensor to go dead. The wiring needs to be ohm tested to make sure stuck shorted to ground. There is no accurate way to test the knock sensor without an oscilloscope. This can cause drivability and timing control issues.

This details will help.
Thanks.

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Go to Newly Launched

FREE Car repair guide? 
http://technoanswers.blogspot.in/2012/03/car-repair-guide.html 

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